CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 392
Thebuffer capacityof a buffer,βb, related to the added base is defined by the relationβb=dcb
d pH, (11.104)
wherecbis the concentration of the added base. The buffer capacityβarelated to the added
acid of the concentrationcbis
βa=dca
d pH, (11.105)
The higher the buffer capacitiesβbandβa, the less the buffer solution changes its pH. The
highest buffer capacity is that in solutions in whichcs=c, wherecis the concentration of an
acid or a base.